7.1.3 Interoperable Global Variables
Variables can be made accessible from C using the C binding attribute,
optionally together with specifying a binding name. Those variables
have to be declared in the declaration part of a
be of interoperable type, and have neither the
MODULE m USE myType_module USE ISO_C_BINDING integer(C_INT), bind(C, name="_MyProject_flags") :: global_flag type(myType), bind(C) :: tp END MODULE
_MyProject_flags is the case-sensitive name of the variable
as seen from C programs while
global_flag is the case-insensitive
name as seen from Fortran. If no binding name is specified, as for
tp, the C binding name is the (lowercase) Fortran binding name.
If a binding name is specified, only a single variable may be after the
double colon. Note of warning: You cannot use a global variable to
access errno of the C library as the C standard allows it to be
a macro. Use the
IERRNO intrinsic (GNU extension) instead.